The Valley of Butterflies is situated at Rhodes Island in Greece. A popular tourist attraction, which was once full of butterflies. Now its hard to find any butterflies there. And it not just global warming, its also because of increase in number of people visiting the place.
I managed to spot one butterfly and a nice Lilly too.
The article is a good example of global warming. I noticed another similar one that talks about reaching the danger zone due to global warming
http://www.kanbal.com/index.php?/Latest/danger-zone-carbon-dioxide-to-blame.html